Depending on the polarity of an ESD event you apply to the circuit's input connector, its high-voltage spike discharges through diode D1A or D1B into the positive or the negative power-supply rail.

依靠ESD适用电路输入连接器的极性，其高电压放电通过二极管d 1a或d1b进入供电正向或负向电源。

youdao

They connected the rail lines with a golden spike.

VOA: special.2010.02.25

In the early days of the oil industry, a New England snowstorm or a washed-out Texas rail bed could lead to a spike in prices or even shortages for entire regions of the country.

FORBES: Ethanol: Getting There Is None Of The Fun